4.88 FD problems? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

azynneo · 12-13-2015, 07:53 AM

So.. I just past my 500 mile break in mark and changed out the gear oil.

I'd like to note the car is stupidly fast at accelerating now but theres a few things thats starting to happen.

Howling while turning, I posted this in the suspension thread but read everywhere on google that said it could be diff problem.

Air leak sound in the rear when I accelerate past 70 mph.

Downshift rpm increase with no increase in speed unless I put the foot WOT.

Squeaky sound on suspension while accelerating up hill / decelerating down hill.

All of this happened after I drove the car normally after break in period. 4-5k RPM highest shifts and the occassional 6k

Thoughts?

FRS Justin · 12-13-2015, 09:09 AM

Who built the diff??

azynneo · 12-13-2015, 03:37 PM

Quote:

Originally Posted by FRS Justin

Who built the diff??

corner3garage

Turdinator · 12-13-2015, 09:42 PM

Those symptoms sound like multiple issues. Are you auto or manual? Did you install any bushes or suspension bits at the same time? Are you using the factory LSD center or an aftermarket brand?

azynneo · 12-13-2015, 11:09 PM

Quote:

Originally Posted by Turdinator

Those symptoms sound like multiple issues. Are you auto or manual? Did you install any bushes or suspension bits at the same time? Are you using the factory LSD center or an aftermarket brand?

a/t, no just coil overs, factory lsd

SUB-FT86 · 12-14-2015, 02:11 PM

Out of all that you said "stupidly fast at accelerating" is the only part I paid attention to. I wish I knew someone close by with a A/T and 4.88

Toyota86.ir · 12-14-2015, 11:53 PM

Quote:

Originally Posted by azynneo

So.. I just past my 500 mile break in mark and changed out the gear oil.

I'd like to note the car is stupidly fast at accelerating now but theres a few things thats starting to happen.

Howling while turning, I posted this in the suspension thread but read everywhere on google that said it could be diff problem.

Air leak sound in the rear when I accelerate past 70 mph.

Downshift rpm increase with no increase in speed unless I put the foot WOT.

Squeaky sound on suspension while accelerating up hill / decelerating down hill.

All of this happened after I drove the car normally after break in period. 4-5k RPM highest shifts and the occassional 6k

Thoughts?

What's the brand of diff oil?
You should use yoyota lsd 75-85 or 75-90 diff oil

azynneo · 12-15-2015, 12:39 AM

this is wehat it sounds like on the high way now it howls on the highway. I used motul 300

12-13-2015, 07:53 AM	#1
azynneo Senior Member Join Date: Jan 2014 Drives: FR-S Location: Cali Posts: 582 Thanks: 50 Thanked 44 Times in 34 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	4.88 FD problems? So.. I just past my 500 mile break in mark and changed out the gear oil. I'd like to note the car is stupidly fast at accelerating now but theres a few things thats starting to happen. Howling while turning, I posted this in the suspension thread but read everywhere on google that said it could be diff problem. Air leak sound in the rear when I accelerate past 70 mph. Downshift rpm increase with no increase in speed unless I put the foot WOT. Squeaky sound on suspension while accelerating up hill / decelerating down hill. All of this happened after I drove the car normally after break in period. 4-5k RPM highest shifts and the occassional 6k Thoughts?

12-13-2015, 09:09 AM	#2
FRS Justin Senior Member Join Date: May 2014 Drives: 2013 Asphalt FRS Location: San Antonio Posts: 994 Thanks: 693 Thanked 695 Times in 417 Posts Mentioned: 22 Post(s) Tagged: 1 Thread(s)	Who built the diff?? __________________ Instagram FT86PROJECT9S Facebook FT86PROJECT9S 710whp

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12-14-2015, 02:11 PM	#6
SUB-FT86 86 Member Join Date: Dec 2010 Drives: 2013 Toyota 86 2.0T (Asphalt) Location: Atlanta, Ga Posts: 3,129 Thanks: 126 Thanked 527 Times in 296 Posts Mentioned: 2 Post(s) Tagged: 2 Thread(s)	Out of all that you said "stupidly fast at accelerating" is the only part I paid attention to. I wish I knew someone close by with a A/T and 4.88

12-15-2015, 12:39 AM	#8
azynneo Senior Member Join Date: Jan 2014 Drives: FR-S Location: Cali Posts: 582 Thanks: 50 Thanked 44 Times in 34 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	this is wehat it sounds like on the high way now it howls on the highway. I used motul 300

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